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@umeneri

jsでページ内の全クラスのリストを取得する

Last updated at Posted at 2017-08-14

ES6で書いています。重複排除済み。chromeのDeveloperToolでどうぞお試しあれ!

const classes = Array.from(document.querySelectorAll('[class]')).map(el => Array.from(el.classList));
const flatten = Array.prototype.concat.apply([], classes);
const set = new Set(flatten);

Array.from(set);

ES5は時間があったら書きます。

参考

JavaScript で flatten - Qiita

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